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Experimental Relationship Between Macroscopic Moduli and Molecular Bond Moduli: A Laser Raman Study of Monocrystalline Fibers of Poly-HDU.

机译：宏观模量与分子键模量的实验关系：聚HDU单晶纤维的激光拉曼研究。

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The application of a tensile stress to a macroscopic monocrystalline fiber of a polydiacetylene, an extended-chain polymer, causes the Raman-observed C triple bond C and C=C in-chain vibrational frequencies to decrease linearly with elongation. The polymer studied, poly-HDN, results from the solid-state polymerization of R-C triple bond C triple bond C-R where R = CH2OCONHC6H5. This experimental relationship between the molecular bond (spectroscopic) effects and the macroscopic properties is analyzed by relating the bond moduli (force constants) and Young's modulus for the fibers. It is shown that possible effects due to stress-induced changes in electron-delocalization in this fully conjugated polymer are negligible and the principal contributions to the bond frequency shifts is due to bond anharmonicity. Models which assume that the entire effect is due to bond anharmonicity produce calculated dependencies of V(C=C) and V(C triple bond C) upon fractional elongation which are in good agreement with that observed. (Author)

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作者
mitra, vijay k. baughman,ray h.;
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年度 1975
页码 1-25
总页数 25
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Polymers; Acetylenes; Tensile stress; Raman spectroscopy; Chemical bonds; Single crystals; Synthetic fibers; Modulus of elasticity; Fibers;

机译：聚合物;乙炔;拉伸应力;拉曼光谱;化学键;单晶;合成纤维;弹性模量;纤维;

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Experimental Relationship Between Macroscopic Moduli and Molecular Bond Moduli: A Laser Raman Study of Monocrystalline Fibers of Poly-HDU.

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